Personally, I think that "menki" and "fenki" are fine words for RPing. After all, we don't say "male human" or "female human" all the time. It adds a bit of Yliakum-exclusive slang, which is exactly the sort of thing we need. (However, this of course presents the problem of why there aren't special words for male and female elves/dwarves/diaboli/ynnwn.)